Quite common - just pop in and ask your pharmacist for an over the counter treatment - usually in a cream form.
Also your girlfriend will need to be treated as well - other wise you will just pass it back and forth.
Men can develop a male yeast infection treatment although it's not as common for men as it is for women. While outbreaks of yeast overgrowth can show up anywhere on the body the most common locations are the mouth, skin and the male genitals. Oral yeast infection, often called thrush, is covered on our Oral Thrush page [future page]. The rest of this page focuses on penile yeast infection. Women should also be familiar with male yeast infection symptoms since it is possible for partners to transmit the yeast infection back and forth.